multiplus_faq
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multiplus_faq [2017-09-22 06:42] – mvader | multiplus_faq [2019-10-17 13:48] – [3.1 Derating of the power factor] guystewart | ||
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- | What to do when a MultiPlus does not accept generator power | + | __What |
- | ---- | + | __ |
Power supply from a generator is typically more variable than a power supply from shore or the main grid. The MultiPlus is sensitive to this and will reject power that is outside of it's programmed settings causing the unit to not connect, synchronise or charge. | Power supply from a generator is typically more variable than a power supply from shore or the main grid. The MultiPlus is sensitive to this and will reject power that is outside of it's programmed settings causing the unit to not connect, synchronise or charge. | ||
- | **Selecting a Generator** | + | ==== Selecting a Generator |
Some generators are more suitable than others for use with inverter/ | Some generators are more suitable than others for use with inverter/ | ||
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Inverter based generators have a characteristic where the motor continues to run even if the unit has electronically overloaded and no longer delivering power. It may appear that the generator is operating and the system is charging when it isn't. These units are also more easily overloaded by surge loads, as they are electronically limited rather than mechanically. | Inverter based generators have a characteristic where the motor continues to run even if the unit has electronically overloaded and no longer delivering power. It may appear that the generator is operating and the system is charging when it isn't. These units are also more easily overloaded by surge loads, as they are electronically limited rather than mechanically. | ||
+ | Make sure that the generator, inverter/ | ||
+ | Eg 230V / 50hz. Do not mix and match frequencies and voltages, or parts from different regions. | ||
- | **Generator Sizing** | ||
- | It is possible to overload generators with the power demanded by the Multi' | + | ==== Generator Sizing ==== |
- | 2 kVa - 800VA Multi | + | It is possible to overload generators with the power demanded by the Multi's charger. The following generator sizings are indicative of those sizes are appropriate for the charging potential of the various multis. It is still possible to overload these generator sizings with large loads, and flat batteries using the PowerAssist function, so they should be treated as safe minimums to eliminate this as a potential cause of issues. A bigger generator is usually better. |
- | 2.5 kVa - 1200VA Multi | + | ^ Inverter Charger Size ^ Minimum Recommended Generator Size ^ 240V AC Input Current Limit ^ |
+ | | 800VA | 2 kVa | 5A | | ||
+ | | 1200VA | 2.5 kVa | 7A | | ||
+ | | 1600VA | 3 kVa | 10A | | ||
+ | | 3000VA | 5 kVa | 16A | | ||
+ | | 5000VA | 8 kVa | 25A | | ||
- | 3 kVa - 1600VA Multi | + | If your generator is smaller than the recommended size for your inverter/ |
- | 5 kVa - 3000VA Multi | + | ==== Operation ==== |
- | 8 kVa - 5000VA Multi | ||
- | |||
- | **Operation** | ||
It is important to note that the inverter/ | It is important to note that the inverter/ | ||
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- | **Software Changes** | + | ==== Software Changes |
The settings which you should attempt first are ' | The settings which you should attempt first are ' | ||
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**AC low disconnect: | **AC low disconnect: | ||
- | **AC Low connect:** minimum value: at this value or any higher value, the MultiPlus will reconnect after having disconnected (default = 187Vac). | + | On generators where the output voltage drops under load, setting |
+ | The reason this happens is that the Multi will synchronise and follow the generator voltage as it sags. | ||
+ | |||
+ | If the generator is disconnected under load (either due to low-voltage disconnection, | ||
+ | |||
+ | As overload is driven by current, not power, this can result in an overload. | ||
+ | |||
+ | By increasing this minimum voltage level, you tell the inverter/ | ||
+ | |||
+ | **AC Low connect:** minimum value: at this value or any higher value, the MultiPlus will reconnect after having disconnected (default = 187Vac). | ||
===== 1.4 Maximum voltage levels ===== | ===== 1.4 Maximum voltage levels ===== | ||
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**AC high connect:** maximum value: at this value or any lower value, the MultiPlus will reconnect after having disconnected (default = 265Vac). | **AC high connect:** maximum value: at this value or any lower value, the MultiPlus will reconnect after having disconnected (default = 265Vac). | ||
+ | |||
+ | |||
+ | ===== 1.5 Loss of mains detection (LOM) ===== | ||
+ | |||
+ | Loss of mains detection will push and pull at voltage and frequency to see if there is still a generating source. This process can cause issues with some generators, or high impedance connections to generators. | ||
+ | |||
+ | For large and stable Generators Type B LOM will work, and is safer. | ||
+ | However, if you are experiencing issues with voltage, frequency or power fluctuations, | ||
+ | |||
+ | **Disabling LOM** | ||
+ | |||
+ | Disabling the LOM on an input connected to the grid is only allowed when other external safety equipment is installed. | ||
+ | Disabling the LOM on an input connected to generator can be done, but then other methods / warning signs / physical lockout safety measures must be provided. Ensuring that any installer that will work on the generator, wiring or system, will make sure to also switch off or otherwise disconnect the Inverter/ | ||
+ | |||
+ | For Full information on Loss of Mains detection, please see [[ve.bus: | ||
+ | |||
+ | |||
+ | **Example configuration in VEConfigure** | ||
+ | |||
+ | * A generator that requires LOM to be disabled. | ||
+ | * Generator on AC in 1, and grid on AC in 2, as recommended. | ||
+ | |||
+ | {{:: | ||
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{{:: | {{:: | ||
- | ===== 2.1 Load impact limitation ===== | ||
- | **Dynamic current limiter** : (default = disabled) | + | ===== 2.1 Dynamic current limiter |
+ | |||
+ | (default = disabled) | ||
This feature is intended to reduce load impacts on low-power generators, such as portable inverter technology models. These generators may be unable to respond to sudden load impacts. | This feature is intended to reduce load impacts on low-power generators, such as portable inverter technology models. These generators may be unable to respond to sudden load impacts. | ||
By activating the limiter, the **PowerAssist®** function of the MultiPlus will absorb the change in load and transfer it smoothly to the generator, giving it time to react. | By activating the limiter, the **PowerAssist®** function of the MultiPlus will absorb the change in load and transfer it smoothly to the generator, giving it time to react. | ||
+ | |||
+ | ===== 2.2 AC Input Current Limit ===== | ||
+ | |||
+ | The charger on the Multiplus is very powerful. If you have an existing generator that is not able to supply the maximum charging current of the Multi, you will need to adjust the AC Input Current Limit in the General Tab of VE-Configure. | ||
+ | |||
+ | A reasonable starting point for the AC Current input limit is 80% of the generator capacity in Watts. For example: | ||
+ | |||
+ | a 5kVA generator typically provides about 4 kW | ||
+ | |||
+ | 80% of 4 kW is 3200 W | ||
+ | |||
+ | 3200 W / 230 V volts = 13.9 A | ||
+ | |||
+ | Set the AC Current Input Limit to 13 A | ||
+ | |||
+ | If you find the generator is still overloading, | ||
+ | |||
+ | There is another additional setting in the Charger Tab for DC current limiting. | ||
+ | |||
+ | The AC input current should be adjusted first, as it also takes into account the PowerAssist functionality. | ||
+ | |||
+ | The Multi is able to synchronise the generator waveform with it's own and provide power to the loads from the generator as well charging the battery. This means it still possible to overload the generator with a low 'DC Charger current limit' if the AC input limit is not also set correctly to the size of the generators output. | ||
+ | |||
====== 3. In the " | ====== 3. In the " | ||
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{{: | {{: | ||
- | **Derating of the power factor** | + | ===== 3.1 Derating of the power factor |
Some generators have a waveform which makes it difficult to charge with the normal charge mechanism. Through activating the " | Some generators have a waveform which makes it difficult to charge with the normal charge mechanism. Through activating the " | ||
Disadvantage of using this option is that the input power factor, normally equal or close to 1, will be degraded. This function should be used only when the preceding ones are ineffective. | Disadvantage of using this option is that the input power factor, normally equal or close to 1, will be degraded. This function should be used only when the preceding ones are ineffective. | ||
+ | |||
+ | This leading or lagging power factor will have the effect of demanding more kVa from the generator for the same or less DC Watts delivered to the batteries. You may need to further reduce the DC Current Limit in the Charger tab of VEConfigure if the generator continues to overload after changing this setting. | ||
+ | |||
+ | Effectively, | ||
+ | |||
**Important note:** | **Important note:** | ||
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A detailed description of all settings is available in the VE-Configure help menu, and more instructions are available in our manuals. | A detailed description of all settings is available in the VE-Configure help menu, and more instructions are available in our manuals. | ||
- | ===== Disqus | + | ====== 4. In the “Inverter” tab of VE-Configure: |
+ | |||
+ | ===== 4.1 PowerAssist ===== | ||
+ | |||
+ | The [[https:// | ||
+ | |||
+ | If you have a small generator and have trouble getting connected or staying connected, Disable PowerAssist to allow the device to reduce the AC input current limit. | ||
+ | |||
+ | |||
+ | |||
+ | ====== Still not connecting? ====== | ||
+ | |||
+ | If the unit is still not connecting, switch the Multi over to Charger only mode. | ||
+ | |||
+ | Try with a different generator. | ||
+ | |||
+ | There can be issues with generators with Residual Current Devices (RCD' | ||
+ | |||
+ | |||
+ | If there is still no connection, contact your dealer or distributor. Tell them the steps that you have taken already to attempt to get it to work and they can help from there. | ||
+ | |||
+ | |||
+ | ====== Further Reading ====== | ||
+ | |||
+ | There have been extensive articles and documentation written about generators and their interaction with Victron systems. This includes troubleshooting, | ||
+ | |||
+ | [[https:// | ||
+ | |||
+ | [[https:// | ||
+ | |||
+ | [[https:// | ||
+ | |||
+ | [[https:// | ||
+ | |||
+ | [[https:// | ||
+ | |||
+ | [[https:// | ||
+ | |||
+ | |||
+ | |||
+ | |||
+ | ===== DISQUS | ||
~~DISQUS~~ | ~~DISQUS~~ |
multiplus_faq.txt · Last modified: 2024-07-17 06:57 by guy_stewart